US Fish & Wildlife Service
Date of this Version
1992
Citation
1992 Author
Abstract
Table of Contents
Introduction .......................................................... 1
Feather groups of the duck wing ............................ 2
Mallard .................................................................. 5
American black duck ........................................ 10
Mottled duck ....................................................... 13
Gadwall .............................................................. 16
American wigeon ................................................. 19
Green-winged teal ............................................... 24
Blue-winged and cinnamon teals ......................... 28
Northern shoveler ................................................ 31
Northern pintail .................................................. 34
Wood duck .......................................................... 39
Harlequin duck ................................................... 42
Steller's eider ........................................................ 45
Separation of redhead and canvasback ................. 48
Redhead .............................................................. 49
Canvasback. ......................................................... 54
Separation of greater and lesser scaups ................. 59
Greater scaup ....................................................... 59
Lesser scaup ......................................................... 6 5
Ring-necked duck ............................................... 70